<template>
  <div class="login_container">
    <div class="login_box">
      <!--头像区域-->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="登陆头像">
      </div>
      <!--登陆表单区域-->
      <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0px" class="login_form">
        <!--        用户名-->
        <el-form-item prop="username">
          <el-input v-model="loginForm.username" prefix-icon="iconfont icon-user"></el-input>
        </el-form-item>
        <!--        密码-->
        <el-form-item prop="password">
          <el-input v-model="loginForm.password" prefix-icon="iconfont icon-3702mima" type="password"></el-input>
        </el-form-item>
        <!--        按钮区域-->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登陆</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>

  </div>
</template>

<script>
export default {
  name: "Login",
  data() {
    return {
      // 这是登陆表单的数据绑定对象
      loginForm: {
        username: 'admin',
        password: '123456',
      },
      // 表单的验证规则对象
      loginFormRules: {
        // 验证用户名是否合法
        username: [
          {required: true, message: '请输入登陆名称', trigger: 'blur'},
          {min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur'}
        ],
        // 验证密码是否合法
        password: [
          {required: true, message: '请输入登陆密码', trigger: 'blur'},
          {min: 5, max: 15, message: '长度在 5 到 15 个字符', trigger: 'blur'}
        ],
      }
    }
  },
  methods: {
    // 点击重置按钮，重置登陆表单
    resetLoginForm() {
      //  this指向当前登陆组件的实例对象，即Login.vue的实例
      this.$refs.loginFormRef.resetFields();
    },
    login() {
      this.$refs.loginFormRef.validate(async (valid) => {
        if (!valid) return;
        // 解构赋值：将其中的data重命名为res
        const {data: res} = await this.$http.post("login", this.loginForm);
        if (res.meta.status !== 200) return this.$message.error('登陆失败');
        this.$message.success("登陆成功");
        // 1. 将登陆成功之后的token保存到客户端的sessionStorage中
        // 1.1 项目中除了登陆之外的其他API接口，必须在登陆之后才能访问
        // 1.2 token只应在当前网站打开期间生效，所以将token保存在sessionStorage中
        window.sessionStorage.setItem('token', res.data.token);
        // 2. 通过编程式导航跳转到后台主页，路由地址是/home
        await this.$router.push('/home');
      })
    }
  }
}
</script>

<style lang="less" scoped>
.login_container {
  background-color: #2b4b6b;
  height: 100%;
}

.login_box {
  width: 450px;
  height: 300px;
  background-color: #fff;
  border-radius: 3px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);

  .avatar_box {
    height: 130px;
    width: 130px;
    border: 2px solid #eee;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px #ddd;
    position: absolute;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #fff;

    img {
      width: 100%;
      height: 100%;
      border-radius: 50%;
      background-color: #eee;
    }
  }
}

.login_form {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 20px;
  box-sizing: border-box;
}

.btns {
  display: flex;
  justify-content: flex-end;
}

</style>